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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8674e3039803b3df89fe6d8bcb696fb6d7c49a8e68e125bff955da9ad000cd' 
  AND token = '71WAxp51uRZMIgodJi+ND5Rr3LCGmuY8X+KzN9iP80g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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