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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2305e69c295d1e24865246136157d6e41098206dc2c0c46d62d18746d8bbee38' 
  AND token = 'ImpvwiM/C2pLym5by+ut/7QNn/DDmdiDQL6NH+wcyHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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