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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61daeefbc21f0d7abe1453e73b23b1362f01c33c64c395d63c45101b16f30030' 
  AND token = 'V2QRFF0Di8r8dV/j61G1cIP6dObcC4RUUqKFrX6ZQ8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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