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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c505b3a1e6f2c0b5d768324407a5fa48e2085cc63ac7058eb5def72ac5e11fe' 
  AND token = 'k4FqmtD6vPRCAhU8v5RJXprtNM6rVh8cYQnLpGJLdBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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