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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a213fe8f41dd347a9c1340af9ed7c7c08716263813849950a1f1f0caf237313' 
  AND token = 'v/CrjEeW+Od20Yb98UHqBNjkVfN2rexf+rVrb39gIXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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