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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e34653b9cb2618b5692e0c69f37709aecb14164336425d12dfbfb5ab2c7b720' 
  AND token = 'AMEr9zRYy8ECHc5+pt5vUrv43gjApr0fkza9UGzvnwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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