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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c576e466d0d0c035f1dde8a0ca9af5ce9edd1e9fadcf0d13d6eef61dda90e5' 
  AND token = 'TlKnLpejoXZm5p0kcpFyjqcUFJkvXxjkXwOA2T1CB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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