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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94102ffd420d2a7a56b4a8ccacf98ba6812f29339090efdc813ca8872b5bdac' 
  AND token = 'fylHW1YD6YcbcI5v3iaYlRAsnC5W0K52vseLO6/RKvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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