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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0c151318714c3276aae6a7249f0752a0261a6e748cf9e3ab3d0ab6593c9b42' 
  AND token = '/ky3sujbjftG51TY8tAxwPD0Rdf4QL4EMKDwsz84eFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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