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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6520be88012b7117916a60ffef0b2fd38c9fc4bf0d45e8c82d86814caf7eba' 
  AND token = '58g7SizGnH9UpXpLtRjx7y/RP8efqTkDzQkeOQ3SoV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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