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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a7eedc186695ade005a185ccd823cc375e79cb406e3b0752c5947a074b71e2' 
  AND token = '7QxXXPIQLai1MJLn117eTysCOPtI+Hlk4k4vGNSReWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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