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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f482f09365d9c0992f90b3f9b866da56233719764ae1190eaaf3cb56b989eb' 
  AND token = 'WH14Q3ozOi3wpwCYUwyMYScSJUNuACWzJTavCqK28gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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