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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95351ed899e0dc0728a7b21d05632945ef78d4c37d4a86604099c83391df8734' 
  AND token = 'SP+Y8LCZb6sDkHZ5YJAiWCcGDN+m3oM0d34oHCr7fNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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