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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d26f2918c25fd229cbcfb04f9a50650eee79d28db652d7f08db8fd50f82c47' 
  AND token = 'lV1FKCO9bPgzFaF1Lz3gEKOFKjKIT0i7H3aKdc/XLXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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