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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbe4569a80b56fb66cc01e5f8b99aedb6c17294f4fb23bdf687491af7781a5b' 
  AND token = 'vBe1zW9FyRTzdjkARIiCeVf+E0WFD/ponyfcoI5tPb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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