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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be4c2fd76ebd3b50f99bf611bb1822d84953b8b3d53c28bd8e9df7384a7070d' 
  AND token = 'qy4vwQ3Oeyu+CbAOIWQu7UvEZts7ZQncjWA8B2l8sdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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