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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610661043c78f5dfc5bb87938926604b6b030830662620bb35d137b6207f469c' 
  AND token = 'h2OGym6yrFIY3osKQvxb4Zoen0kcRN13BAlBI9lEH2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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