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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40f7fcba95acc825e5dfc16cb247fd8e91d2b1a7574094f111b9ee4dacf7470' 
  AND token = '77jrSBSN6tQwJr05soDOVywzJLQArYbYLEjbtwKiHmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}