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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd4ce1e0d63554098059503171f3ba9bba8d57c4b80eb3d37e579ba354e7699' 
  AND token = 'lYdTgBPNqVXX5e2tWv4Q482gKuG9lyKleuhtduFGn0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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