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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc8925847ba458fcdd99151c0ce7bea14bf6b7cab5ee8fb76bd138b16ea13a0' 
  AND token = 'kFvvG/7CIFlJjh41FpMs9COBpLkAcAR6jTNuH2X5V3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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