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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8f55c0c93c0536e3ca225a4e2d1402bfc9a684e3f8f4ae93b4e2b463aef2b0' 
  AND token = 'nwwcgBPXa4+G3aou5z+edS5H6HBSpl03z0CZ8Lh4aIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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