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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff55b427ef5657028f68bbfc955e982f3578a3d7d90a9ad8fc17c616a5250e5' 
  AND token = 'zTZHsncEJuem/bx10vAZg/F1Wga3hqUFczdj70I/Nis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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