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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6d73e98228c5b2110b0badde8926741759531a2ef1b6d482d392249240f13a' 
  AND token = 'zsb4wSmyPeJyUF2SVm8jl43dqZMb6OayweZ7Dh+imH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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