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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9507a2fb7c35ab54e88d4403221764cfd3514a12f96797a2dd38f24204e82bb0' 
  AND token = 'UzC0JY87P8IMAyWyYBf1pqmuT2+nn4txE+kdsms5D1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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