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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d5f804c5ba5823c80eb87e1eab7dc3cba616b5638094b65ce8eb957d4cb6a1' 
  AND token = 'GXzXlyt/2L8fESPJdWbVsDfUpALdrYaL/k1TKsw6JMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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