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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0843e8f848669207b74cc0aa5df360003f7dd45b4baef54d42bc041445380a5' 
  AND token = 'R6AXpDzwQ8EFnaravvyQwspfE5ghqv89I/wpQmKA7Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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