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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d36329ae12af0b1c3028eb76ab2ead75e1ae331a8523b492f479730904ec5e' 
  AND token = '9BrMfvW1BW+Ui5tfclVIXaGvbnLfr1kUaa2Wi2NQLzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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