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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3172fc80b3771463677b7fa8a7ffeb60433961814bd6379e193f8c92eecf3e79' 
  AND token = 'E+h9hwggMJ2TSG08YeS6l0fzpRRSU5qwAm+Jbm5bIGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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