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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2138d5f670b8defbc59212575bc3f22cf51052c09d156c225b33873b7cc60f' 
  AND token = 'QwJisPtbty24HhzsIS7ejfc8J734orKF4tOSVMccu+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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