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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91322760659a999ca330ef0e3d05abf336de6f345e3fc3e74e3767682c6b2d2d' 
  AND token = 'n7QRhTabYS34xK5daWfPrOmZPQ88gotZhfGgSPQTMvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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