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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa15792bf36f83c137e4eedfe31016bd1ebd938cae07559be1f03306e775c5cb' 
  AND token = 'ZWe5mY/4lz8FarzWX9eDfbdlaBe/pvN8Z+8211cJYv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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