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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cb1689b7d697e08d333ae2ee2b8aec21167c5b016f6138909c0631f2462067' 
  AND token = 'x9GhmZ4kN22eVWVI9jXYjQYkTQP98Y97MHXLjl42dfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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