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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec985e2a48274fbfa0c7599aba4e9dd0a6f62a83482f9e3d2d9d168c4f0b9a5' 
  AND token = 'TS4SBEfx9qEZF5tTo69WUR+oQlf+V8SEMJ7M6q/wYzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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