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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897e9aebbf1c9381988a971cff25c30f959d7f61a677b94abc21a41956ada246' 
  AND token = 'Qw6DtDqXx1K0m/Oj/KXUk3iAqZbrWkw7WyU3rtg0rUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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