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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5489dbf0405095ca04a7dda4825bb87d02e1148914012650996d2d2a018b5e' 
  AND token = '8LWBXbgUmcYFZqTmnIucQOn1CgRCfTDd/V+nCWnOH+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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