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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c074957360dbddc74dffaddc17e5379f212bf9aca2bfb0fdef053642235d75e' 
  AND token = 'WF3h/lGLejpWd2tcrrvCu/hpNIXupAv8ckUbYRB4K9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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