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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ab577d4bb862d2e1e7955d22d1bbaffd8dcddcf396a1b26987b06c594c20ce' 
  AND token = 'T4ZaZwChetRlGLxJ/3uqdbkM8X/yQx0nLyqm21C37J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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