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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf0216e9dd3c249e2512fff38253e52f048615a2245cbc8fc074085a18bd5ae' 
  AND token = '/pw/ixwid5ejF17CdGGLPjGoN73l4eryQBSCrWBw7aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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