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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c7a53ec0c3baa8568449d996d8df127eb33ed969a9878a1eb65666c8584e49' 
  AND token = '+ajN2IUDFl1ePQtemqOz0J71DhSNZVZsUSF3Rau2u/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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