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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d776e2cfacda79b4cb5c4654c4bf1f4c0eee702783f19c9d77ef8ee8dba943' 
  AND token = 'ou/gALTV8c9AFBZ9C+VMiS0GUByb+WMlqx17UoA3jro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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