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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911626b88d80f54c7d9e92c41192f8187777557b5af768293a838703274ca312' 
  AND token = 'iwC6WGy2s5m0UDoXTbXCd4Po2ywgfYr/B7trhN7CNv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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