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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76998c735a9f1d28af233139c1a807c3ea1cfd3ba1057af177c7ce632786e827' 
  AND token = 'rpvc+R/ScR619KJp2NLaRSIf1Z3Bz2jlS0E56miIVsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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