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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87807888ee43747f4dd2ef5c0230c145f8698fc720507692b1fa2032888fba4d' 
  AND token = '6jSFPlZvYMVNGc5upxf9oF9NemskQfHjuEF+MV6Mhes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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