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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab104f68a2a641296c259816fd03fc5da6e00610e64eed2c0301ddd150019488' 
  AND token = 'GC/Rx8M04Sl/FW4Dg+3Ryw+jhNzxIwHk1acLQFnIDkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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