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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba09d7a0b053a6125affecba0b6d6e3d2e36ad1a65febbdf412bfe9227c7cbb8' 
  AND token = 'KZHdaZzke/SGppYUKFcQCx+4yMZunUJDJnqlD6lAA8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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