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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275ea0c2f55b3bbee8d4a255c87747b2428dc28a267bcb52902c9544f4dd69f7' 
  AND token = 'GemwnHinPSblE3K2uQc81GCp7Gpfn4P4CNrGnXnQvZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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