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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908484e5c53314038f7ab509920c988c26c43ee58a1c598328993b343a2536e8' 
  AND token = '1e0japFkm77M9Q1nNQIhOVk2I4dAmvBIJyXHxEy6rNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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