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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52bddc69f594b4f39cac65795b7594844f236fe2906c23eb8b7fa04903f5439' 
  AND token = 'DN4LT2wJFnMJXt+sKc5NRtFhtgkeWhYdzcFrt5R8TZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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