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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050c39c7e2af2684101774230b4deefc452c304e260d360d4b2f236a6855563f' 
  AND token = '5E6wmL5fARsq30NlSnkmLt01Qyj6i2cFUG2FTHIRZes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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