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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbbe3c9487451c7550588f3a3698f758c05ff9e4b1aa18c39b3f68157b8d6ee' 
  AND token = '/4rJuomOWxHDRb94DwhQ0lanJ3hjouWwVEP5WsR8oYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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