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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7647a089074b418c309decda2fd9f0e2078259f34cae2c1ae8bdcd377d5ef924' 
  AND token = 'gAmCgfs4HEhfM82ygdHs10w+7xf5gIfSFrBkENGGm8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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