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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f244ee307eec9e368463ba772d8eff81aa502757bdddf3f80f0eff71853efcf' 
  AND token = 'szedMlgQ/CZ3Yrrvv8C9sfpAQ25xlE7hj9gLywkCnDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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