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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4aaac4711f33a677715422910fe461d898f83404ef7e2a9740acf181f3e6630' 
  AND token = 'oOWuOqiuMyoUedfRcCPcxfhJl3N/l2UXpWmv3MLb5rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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