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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb018061e747f6335ff51569adde0f6656eea054ab78f50cb6851d07f5d093cb' 
  AND token = 'llBqvQGPBV5EMqwmlht9h0RABxuE1sQN57is7NVZj3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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