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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7564173755ae3889e6a16356c7ae44636542a1e8c8da153d564dd6b2ec03d0' 
  AND token = '9YP0ZwEuPYyybGTwguppZUU6THVD+3epTdg13BmdCLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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