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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48f87dee07c8d36dea111d2de2812219154ba818d0b86f42f599bc9769dfff1' 
  AND token = 'pfF2Rt3gkRgnJQBXT6KpLnKsAE7XKXp9dn4/5EQ0H+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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