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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9f0ba9d3f1c07c87de239a1d04b40f7823f79b7e4ad267ac2aa0fff43413ce' 
  AND token = 'pQ0yzdwQKTRSl6V2EQ56dCKBoOSIiFewtMsrDIVMG/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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