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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8f91d908e6dc23e0a27b471e8b82fb06c85382f98dd4ccaa953ee56991e65a' 
  AND token = 'bAaolPInisYJXfKHU7xzOkVAVyuYNU6RbOIJw/t6EEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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