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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b5f413cba028844e678710dfc3f748c7502642fdff1ce1d3fe61eccf86d530' 
  AND token = 'Fnfl3NIF8RUgxfxgCpAL80RQRog5iBu7ertYwuTAfT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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